GB1263434A - Electronic amplitude modulator - Google Patents

Electronic amplitude modulator

Info

Publication number
GB1263434A
GB1263434A GB1687670A GB1687670A GB1263434A GB 1263434 A GB1263434 A GB 1263434A GB 1687670 A GB1687670 A GB 1687670A GB 1687670 A GB1687670 A GB 1687670A GB 1263434 A GB1263434 A GB 1263434A
Authority
GB
United Kingdom
Prior art keywords
modulation
signals
amplitude
hybrid
transmission line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1687670A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELEKTRONIKKLABORATORIET VED NT
Original Assignee
ELEKTRONIKKLABORATORIET VED NT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ELEKTRONIKKLABORATORIET VED NT filed Critical ELEKTRONIKKLABORATORIET VED NT
Publication of GB1263434A publication Critical patent/GB1263434A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Amplitude Modulation (AREA)

Abstract

1,263,434. Amplitude modulation. ELEKTRONIKKLABORATORIET VED NTH. 9 April, 1970 [16 April, 1969], No. 16876/70. Heading H3R. In an amplitude modulation system, the carrier signal is modulated to discrete levels which approximate to the required modulation envelope. In one embodiment, hybrid 6 splits the carrier signal into two components which are differentially phase modulated by transmission lines 13, 14. The lines are provided with short circuiting diodes located along them at predetermined points, so that switching of the diodes in dependence of the modulation signal amplitude will produce stepwise complementary variations in the phase angle of the signals + #, - #. These two signals are then combined in hybrid 7 to give the required amplitude modulated output. The carrier signal is also applied to a similar channel 5 for modulation with a different signal. In a simpler arrangement, Fig. 2 (not shown), a single hybrid and transmission line are used. The carrier is applied to one port (P1). The modulated output is extracted from the diagonally opposite one (P2), and the two ends of a transmission line (23) are connected to the other two ports (P3, P4). Details of the arrangement for generating signals at 90 Hz and 150 Hz from a single 900 Hz source and for converting them to step function signals for switching the transmission line diodes are also described, Figs. 3, 4 (not shown).
GB1687670A 1969-04-16 1970-04-09 Electronic amplitude modulator Expired GB1263434A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO154469A NO125752B (en) 1969-04-16 1969-04-16

Publications (1)

Publication Number Publication Date
GB1263434A true GB1263434A (en) 1972-02-09

Family

ID=19878269

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1687670A Expired GB1263434A (en) 1969-04-16 1970-04-09 Electronic amplitude modulator

Country Status (7)

Country Link
JP (1) JPS5019029B1 (en)
CA (1) CA966560A (en)
DE (1) DE2018102A1 (en)
FR (1) FR2044726B1 (en)
GB (1) GB1263434A (en)
NO (1) NO125752B (en)
SE (1) SE354162B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335321A (en) * 1998-03-12 1999-09-15 Harris Corp Modulation systems

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389057U (en) * 1976-12-22 1978-07-21
JP2012026913A (en) * 2010-07-26 2012-02-09 Toshiba Corp Ils device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1508340A (en) * 1966-11-24 1968-01-05 Csf Side strip generator
FR1539012A (en) * 1967-05-24 1968-09-13 Cit Alcatel Digitally controlled modulation sideband generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335321A (en) * 1998-03-12 1999-09-15 Harris Corp Modulation systems

Also Published As

Publication number Publication date
DE2018102A1 (en) 1970-10-22
FR2044726A1 (en) 1971-02-26
FR2044726B1 (en) 1976-03-19
SE354162B (en) 1973-02-26
NO125752B (en) 1972-10-23
CA966560A (en) 1975-04-22
JPS5019029B1 (en) 1975-07-03

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